It sounds as though you need to get the truck and trailer on a level surface with both loaded for a normal trip and go through a complete hitch set up procedure.
But first you need some weights to confrim that the trailer has about 12% of its total weight on the hitch.
Measure the tops of the fender wells with the truck setting free from the trailer. Record these weights.
Set the height of yout hitch 1/2" to 1" higher than the trailer hitch when the traile ris setting level front to rear.
You will need to tilt the hitch head back a little.
Now hitch the truck to the trailer and attache the load bars.
Measure the height of the fender wells and compare them to the recorded unloaded heights. The truck should squat the same amount on the front and rear. If the rear squats more than the front, you need to shorten the chains one link and try again.
You should normally have 5 to 7 links under tension...not hanging free. And the bars should be nearly level with the ground and parallel to the trailer frame.
If the barsare too close to the frama nd the ends point upward, tilt the head back by adding washers and increase the chain by one link.
Keep adjusting and checking the wheel wells until the trailer is level, the bars level and the truck is pretty level and squatted pretty close to level.
It can be time consuming to a newbie, but it gets easier after you have played with the adjustments some.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot